Try writing to the repository: In other words, opening and using a database file that has two or more names results in behavior that is undefined and probably undesirable. When required to attempt to detect a hot-journal file, if the call to xAccess required by H indicates that a journal file does not exist, then SQLite shall conclude that there is no hot-journal file in the file system and therefore that no hot journal rollback is required.
However, new result codes, and especially new extended result codes, might appear in future releases of SQLite.
If it is, then it is a hot-journal file and SQLite tries to roll it back see section rollback Master journal file pointers? If the database schema was changed by some other process in between the time that the statement was prepared and the time the statement was run, this error can result.
Database pages leak from the free page list When content is deleted from an SQLite database, pages that are no longer used are added to a free list and are reused to hold content added by subsequent inserts.
There is a race condition that can occur when two separate database connections both try to start a transaction at the same time in WAL mode. If, while opening a read-only transaction, SQLite encounters an error while attempting to detect or roll back a hot journal file, then the shared-lock on the database file is released, no transaction is opened and an error returned to the user.
If the database file header is successfully read from a newly opened database file, the connections expected page-size shall be set to the value stored in the page-size field of the database header.
Multiple links to the same file If a single database file has multiple links either hard or soft links then that is just another way of saying that the file has multiple names. The likelihood of an application encountering an SQLite bug is small.
A similar problem occurs if a database file is renamed while it is opened and a new file is created with the old name.
Modifying the contents of a database page. If the call to xCheckReservedLock required by H fails due to an IO or other internal VFS errorthen SQLite shall abandon the attempt to open a read-only transaction, relinquish the shared lock held on the database file and return an error to the user.
Have a question about this project? If set, updates for the listed readings are ignored and associated events are suppressed for a black-out period of at least interval seconds downsampling.
Deleting a hot journal SQLite normally stores all content in a single disk file.
There are global attributes that are used by all devices and local attributes that apply to individual device classes only. Of course, it is also possible that it does exist following system recovery. The following are examples of disabling the built-in protection mechanisms of SQLite:Attempt to write a readonly database svn import.
You can monitor commits to the repository from this page. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
How can I change an SQLite database from read-only to read-write? When I executed the update statement, I always got: SQL error: attempt to write a readonly database.
The SQLite file is a writeable file on the filesystem. May 20, · sqlite[S8]: attempt to write a readonly database Please execute the 'Cleanup' command. Then when i try the clean up command it tells me it failed due to the read only problem also.
A second response to this issue orf read-only.
For my program the user will never directly the database. The user will make selections from the program and then the program will query the database. Turns out, the problem is the permissions on the directory the database resides in.
When writing to an SQLite file, the database engine need to be able to write a lockfile to the database directory.
The fix is easy. The SQLITE_READONLY_DIRECTORY result code indicates that the database is read-only because process does not have permission to create a journal file in the same directory as the database and the creation of a journal file is a prerequisite for writing.Download